Sash lock



FIG. 1 is a perspective view of a sash lock showing my new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a first side view thereof, the opposite side being a mirror image of the side shown;

FIG. 4 is a first end view thereof; and,

FIG. 5 is a second end view thereof.

The broken lines shown in the drawing disclosure are for illustrative purposes only and form no part of the claimed design. 

The ornamental design for a sash lock, as shown and described. 